In number theory, a left-truncatable prime is a prime number which, in a given base, contains no 0, and if the leading ("left") digit is successively removed, then all resulting numbers are prime.For example 9137, since 9137, 137, 37 and 7 are all prime.

The prime 73939133 is the largest right-truncatable prime that repeatedly produces primes when digits are deleted from the right.The numbers 73939133, 7393913, 739391, 73939, 7393, 739, 73, and 7 are all prime.

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17 - SeventeenStudies have shown that if you ask people to pick anumber between 0 and 20, 17 will come up more often than any other. Because of this it is called a‘psychologically random’ number, a number that is perceived as being more random than others.★ In Nordic culture, the 17th day of the year is considered the heart of winter..★ 17 pe khatra :) .

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Hello friends ...Blogging is my ambition and this is my latest venture in this field .Maths is one of the most exciting subject in the world , but the problem lies in the information channel . There are many exciting things related to mathematics that people never get to know . So through this blog I hope I'll be able to get you some exciting trivia which u never knew ...